Multispectral fusion imaging lens and applications

Abstract

The invention discloses a multispectral fusion imaging lens and applications. The imaging lens comprises a window lens (1), a beam splitter group (2), an infrared objective lens group (3) and a visible light objective lens group (4), wherein the beam splitter group (2) comprises a first beam splitter (21), a second beam splitter (22) and a third beam splitter (23), and the three beam splitters are mutually parallel and are all located on an optical path for sequentially splitting infrared light with a long wavelength, a middle wavelength and a short wavelength out of the optical axis; the infrared objective lens group (3) comprises a long-wavelength infrared objective lens group (31), a middle-wavelength infrared objective lens group (32) and a short-wavelength infrared objective lens group (33), and the three objective lens groups are all vertical to the optical path for receiving the split infrared light with different wavelengths one by one; and the visible light objective lens group (4) is located at the tail end of the optical path. The spectral fusion imaging lens provided by the invention can fuse infrared images of different bands and the invisible image, the structure is simple, the light utilization efficiency is high, and the image accuracy is high after beam splitting fusion.

Description

technical field [0001] The invention belongs to the technical field of optical imaging, in particular to a multi-spectral fusion imaging lens and its application. Background technique [0002] Infrared images of different bands have different advantages in describing objects and environments, while the advantage of visible light images is that they are clearly visible to the naked eye. The existing technology often fuses a single-band infrared image with a visible light image, which has certain limitations in its adaptability to the environment and the accuracy of the image. However, the fusion of visible light images with long-wave, medium-wave, and short-wave infrared images can Improve the adaptability of the optical system to the environment, so as to obtain more reliable and accurate image information. [0003] Although the traditional structure of using a spectroscope to split light can achieve the purpose of splitting light, due to multiple reflections and transmissi...

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Problems solved by technology

[0003] Although the traditional structure of using a spectroscope to split light can achieve the purpose of splitting light, due to multiple reflections and transmissions, coupled with the influence of mutual interference, the intensity of the light path after splitting is low, and it is difficult to receive and form a clear and accurate output image

The Chinese patent application with the publication number CN 105572866 discloses a visible light and infrared composite imaging device, which uses a reflector to reflect visible light out of the optical path, respectively receives visible light and infrared light and then fuses them. It is an idea of ​​infrared and visible light fusion, but cannot Solve the problem that the energy reduction of infrared light is difficult to detect after transmission; the infrared detector needs higher energy to detect infrared light, which requires that the infrared energy should not be lost too much, and the energy required by the infrared detectors of different wavelengths is different. There are differences between cooling and uncooling; compared with infrared detectors, visible light detectors require less energy for detection; at the same time, from the perspective of cost and lens size, in order to avoid the interference of the separated optical paths, it is necessary to lengthen the distance between the lenses. The distance increases the lens at the same time, so the use of light splitting structure often results in too large lens and high cost

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